JPH0762225A - Flame retardant composition for flexible polyurethane foam - Google Patents

Abstract

PURPOSE:To obtain a flame retardant composition capable of readily adding in production of polyurethane foam and providing a flame retardant polyurethane foam having good physical characteristics without inhibiting urethane- forming reaction. CONSTITUTION:This flame-retardant composition for flexible polyurethane foam contains 1-30 pts.wt. of N,N',N''-tris(dibromopropyl)-isocyanurate and 99-70 pts.wt. of a flame-retardant organophosphorus compound.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a flame retardant composition for imparting flame retardancy to a flexible polyurethane foam.

[0002]

Flexible polyurethane foams made from polyols and isocyanates are relatively inexpensive to obtain,
In addition, since it has excellent characteristics such as excellent moldability, it is used in cushion materials for automobiles, interior materials, furniture such as beds and sofas, and many other fields. However, polyurethane foam is generally a flammable substance, and imparting flame retardancy to the polyurethane foam is an important issue from the viewpoint of disaster prevention when using the above-mentioned applications. Today, in some fields of application of polyurethane foam such as automobile cushioning materials and interior materials, flame retardation is obligatory.

As a method of imparting flame retardancy to a polyurethane foam, a method of adding a flame retardant at the time of producing a polyurethane foam is generally taken, and various compounds have been proposed as the flame retardant. For example, halogen-containing phosphoric acid ester, halogen-containing condensed phosphoric acid ester, triaryl phosphate, and other organic phosphoric acid esters, antimony trioxide, inorganic compounds such as aluminum hydroxide, and dibromoneopentyl glycol (hereinafter abbreviated as DBNPG). , Tribromoneopentyl alcohol (hereinafter, T
Abbreviated as BNPA. ) (US Pat. No. 3,933,693 and US Pat. No. 4,052,346) and the like have been proposed.

However, each of these conventionally used flame retardants has problems, and is not always in a satisfactory state. That is, when inorganic compounds and DBNPG and TBNPA are used as flame retardants, since these compounds are solid at room temperature, a separate container or a special mixing device is required to uniformly mix the polyurethane raw material, for example, the polyol component. Therefore, the equipment becomes complicated and a huge capital investment is required.

Further, halogen-containing aliphatic phosphate ester such as tris- (chloroethyl) phosphate (hereinafter referred to as T
CEP), tris- (dichloropropyl) phosphate (hereinafter abbreviated as TDCP) halogen-containing condensed phosphate ester, triaryl phosphate, etc. are used to impart required flame retardancy. However, the urethane formation reaction during foaming is hindered, which makes it difficult to form a smooth foam. For example, the inhibition of the urethane-forming reaction requires a long time from the start to the end of foam foaming, resulting in a decrease in productivity, and the physical properties of the foam produced are significantly deteriorated, resulting in a decrease in its commercial value.

In addition, when the amount of the flame retardant added is large in the production of slab foam, the heat generated by the urethane forming reaction does not easily escape from the inside of the foam to the surface, and a "burn" or scorch phenomenon appears in the central portion of the foam. Such scorched foam significantly reduces its commercial value. As described above, the flame retardants proposed hitherto have some problems, and hitherto no satisfactory flame retardant flexible polyurethane foam has been obtained.

[0007]

Accordingly, the present invention is a flame-retardant flexible resin which is easy to add in the production of a flame-retardant flexible polyurethane foam and which does not inhibit the urethane-forming reaction and has good physical properties. It is to provide a flame retardant composition that gives a polyurethane foam.

[0008]

The present inventors have overcome the above-mentioned drawbacks and have a flame retardant property which does not interfere with the urethane-forming reaction in the production of a flame-retardant flexible polyurethane foam and has good physical properties. As a result of various studies to develop a flame retardant composition for obtaining a flexible flexible polyurethane foam, N, N ', N "-tris (dibromopropyl) isocyanurate (hereinafter abbreviated as N-DBN) 1 to 30
It has been found that a composition comprising 99 parts by weight and 99 to 70 parts by weight of a flame-retardant organophosphorus compound gives a flame-retardant flexible polyurethane foam having no influence on the urethane-forming reaction and having good physical properties. The invention was reached.

Accordingly, the present invention provides a flame retardant composition for a flame retardant flexible polyurethane foam, which comprises 1 to 30 parts by weight of N-DBN and 99 to 70 parts by weight of a flame retardant organic phosphorus compound.

[0010]

DETAILED DESCRIPTION The flame retardant composition provided by the present invention is characterized by providing a flame retardant flexible polyurethane foam having good physical properties without inhibiting the foam forming reaction. Here, the N-DBN forming the flame retardant composition in the present invention may be any commercially available one, and may be powdery, granular, granular or the like. Examples of commercially available products include FR-
930 (manufactured by Akzo) and the like.

Next, the flame-retardant organic phosphorus compound which is the other component forming the flame retardant composition comprises a halogen-containing organic phosphorus compound, a non-halogenated organic phosphorus compound and an oligomer thereof. As the halogen-containing organic phosphorus compound,
TCEP, tris- (chloropropyl) phosphate (hereinafter abbreviated as TCPP), TDCP, phylol 2XC20 [2,2-bis- (chloromethyl) -1,3
-Propane bis (chloroethyl) phosphate] (manufactured by Akzo Chemical Inc.), halogen-containing phosphoric acid ester oligomers, halogen-containing phosphoric acid phosphonic acid ester oligomers and the like.

As the non-halogen organic phosphorus compound, aromatic phosphates such as tricresyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate, etc. and aliphatic phosphates such as oligomers thereof, triethyl phosphate, tributyl phosphate, etc. , Mixed phosphoric acid esters such as octyl diphenyl phosphate and nonyl diphenyl phosphate, dimethyl methylphosphonate and oligomers thereof.

These flame-retardant organic phosphorus compounds can be used alone or in admixture of two or more. N-DBN
As a method for producing a flame retardant composition from the above-mentioned flame retardant organic phosphorus compound, a predetermined amount of the flame retardant organic phosphorus compound is used.
Heat to 0 ° C to 70 ° C, agitate with a certain amount of N-
DBN is added slowly to form a uniform flame retardant composition.
In this case, the ratio of N-DBN to the flame-retardant organic phosphorus compound is 1 to 30 parts by weight of N-DBN, and the flame-retardant organic phosphorus compound 9
It is preferably 9 to 70 parts by weight.

When the content of N-DBN is less than 1 part by weight, the effect as a flame retardant is not exerted, and when it is more than 30 parts by weight, it becomes difficult for the flame retardant composition to maintain its uniformity at room temperature. It is not preferable because it causes inconvenience.
If desired, various additives can be added to the flame retardant composition of the present invention.

The additives here include antioxidants such as 2,6-di-t-butyl-4-methylphenol, 2 and the like.
-(1-methylcyclohexyl) -4,6-dimethylphenol, tris (dinonylphenyl) phosphite,
Triphenyl phosphite, others, stabilizers, colorants,
Examples thereof include pigments.

[0016]

When a flame-retardant flexible polyurethane foam is produced using the flame-retardant composition provided by the present invention, a good flame-retardant flexible polyurethane foam is produced without causing reaction inhibition during the urethane formation reaction. In addition, the flame-retardant flexible polyurethane foam has excellent physical properties such as impact resilience and compression residual strain, and can be suitably applied to applications as cushioning materials and interior materials. There is an effect.

[0017]

EXAMPLES Next, the present invention will be described more specifically by way of examples. In the examples, "parts" means "parts by weight". In the examples, the rise time means the time from the start of foaming to the completion of foaming, and the results of each item of foam physical properties were measured according to the following measuring methods.

Impact resilience: 100 mm square or more, thickness 50 mm
A value (percentage) obtained by dividing the repulsion distance when a steel ball having a diameter of 5/8 inch is naturally dropped from the height of 460 mm on the above test piece (percentage) Compressive residual strain: One piece is a square of 50 mm or more and thick 20 mm
The above test piece was compressed and fixed at 70 ° C. for 50% for 22 hours, opened at room temperature, and after 30 minutes, the thickness was measured and calculated by the following formula.

[0019]

[Equation 1]

Flammability: Measured by the MVSS-302 flammability test method. Example 1. Halogen-containing aliphatic phosphate ester oligomer containing diethylene glycol-bis (chloropropyl) phosphate as a main component (hereinafter abbreviated as DEG-PO)
Put 80 parts in a mixer equipped with a stirrer and heating equipment,
Heat to 60 ° C. with stirring. Here, N-DBN2
0 parts was gradually added, and after all N-DBN had been added, the mixture was kept at 60 ° C. for 1 hour. Then, the mixture was gradually cooled to room temperature to obtain a liquid flame retardant composition. 80 parts of DEG-PO used in Examples 2 to 7 and Comparative Examples 1 to 3 and N-DB
A liquid flame retardant composition was obtained in the same manner as in Example 1, except that N1 was replaced by 20 parts.

[0021]

[Table 1]

When the flame retardant composition obtained by the above formulation was used as a flame retardant for a flexible polyurethane foam, the influence on the foam forming reaction and the physical properties of the obtained flame retardant flexible polyurethane foam were investigated. A flame-retardant flexible polyurethane foam was prepared according to the formulation shown in Table 2 by a conventional method to produce a foam having a length of 30 cm, a width of 30 cm, and a height of 20 cm, and the state of foaming was observed. The characteristics were measured and the results shown in Table 3 were obtained.

[0023]

[Table 2]

[0024]

[Table 3]

As described above, by using the flame retardant of the present invention, a polyurethane foam having excellent foam characteristics and high flame retardancy can be obtained.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C08K 5/49 NGD // (C08G 18/08 101: 00)

Claims (2)

[Claims] 1. A flame retardant composition for a flexible polyurethane foam comprising 1 to 30 parts by weight of N, N ′, N ″ -tris (dibromopropyl) isocyanurate and 99 to 70 parts by weight of a flame retardant organic phosphorus compound. 2. When manufacturing a flexible polyurethane foam,
The flame retardant composition for flexible polyurethane foam according to claim 1, wherein 2 to 50 parts by weight is added to 100 parts by weight of the polyol component.